In the early days after the severity of my son's onset of TS, we had a bed in our room for him as that was the only way he managed to sleep without night fears etc.
I was awake a lot during those nights as I was pretty anxious and distressed about what was happening to him and would spend a lot of time just praying and watching him while he slept. It was the only time that he seemed totally at peace, and I never observed tics then.
But yes, as with everything related to TS, different things manifest for different people.
I did go back and look at a lot of references and again, as I realize things are ever changing on what we know about TS....the majority I could find suggested that people with TS tend not to tic when asleep (at least not noticeably) and that if they do, it appeared the tics were greatly diminished.